Devices that collect data about our bodies need power, but they also might need to be very small or even ingestible. To avoid including batteries in these cases, researchers are looking for ways to harvest energy from the body itself.

Birds make it, kids make it - it can be music to our ears or pure torture.



We are going to use a piezo buzzer to make some noise wit

h Arduino.

A piezo buzzer is pretty sweet. It’s...